Reversible transfer mechanism for calculating-machines.



0. WOLTER.

REVERSIBLE TRANSFER MECHANISM FOR GALGULATING MACHINES, APPLICATION FILED SEPT.7, 1910.

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Patented July 18, 1911.

' cm woman; or mxnonr, NEAR BERLIN, Grimm.

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speciilcation'ot Letters Patent. Patent ed July 18, 1911.

Application illed September 7, 1910. Serial No. 580,790.

This invention re ates to a transfer mechanism for the counting wheels of calculating machines and it refers more particularly to such mechanism in which the transfer is effected by means of spring influenced plates. According to this invention such mechanisms are improved by providing a separate plate for the transfer for addition and for the transfer for subtraction,

said plates being each controlled by a separate spring.

The improved mechanism is shown in theaccompanying drawing in various positions.

The wheel 2 which meshes with the driving wheel 1 and with the numeral or counting wheel 3 has pointed teeth. The transfer teeth 5 and 6 are mounted on separate plates 4 and Pa convenient number of which is mounted upon axles 18, 19. The

'- said plates 4 and 4 have oblon slots 9 and fixed with one end to the plates and with the other end to the rear part of the two 10, so that the can longitu inally slide upon their ax es. The front slots are slightly inclined so that the plates can participate in the revolving motion of the toothed wheel 2. A two armed lever 15 pivotally mounted on 13 has a tooth 16 at the end of its right arm and-two pawls 12, 12- at the end of its left arm. Said pawls engage normally (Fig. 1) with the notches 8, 8" of the plates 4,4". WVhen the plates 4, 4 are in this position the pull 5 rings 20, 20* are under tension. The sai springs are armed lever 15. The plates :1, 4 have cams 11, 11' acted uponby the sliding rod 26 of the driving slide of the machine, whereby the plates are pushed back; said driving slide is not shown in the drawing as it does not form part of this invention.

The mechanism operates as follows Suppose the mechanism is in its normal in- Won'ran, a suboperative position (Fig. 1) when the stud 17 of the toothed wheel 2 stands over the toothshaped end 16 of the two armed lever 15, this stud 17 will drag the lever along as soon as the calculating machine is being operated, when, for example the number 1 is to be subtracted the end of the lever 15 is moved downward whereb the pawl 12 gets out of engagement wit the notch 8; the plate 4' being thus released jumps forward under the action of its spring 20 and the next following toothed wheel 2 (Fig 2) is thus turned for the space of one 00 When the plate 4' returns under the pressure exerted by the sliding rod 26 against the cam 11, the pawl 12' drops again into the notch 8 owing to the pull of the spring 20' being obliquely directed;

the plate 8 is locked in its position. The operation is the same with additions only the plate 4 is operatedinstead of the plate 4, the next following toothed wheel 2 being thus revolved in opposite direction (Fig. 3).

I claim:- 1

An improved reversible transfer mechanism for calculatin machines comprising in combination with t e counting gear of the calculating machine, an upper plate and a lower plate, a tooth at the end of each of said p ates, which have a straight oblong slotand an inclined oblong slot, and a notch, axles in said slots, 9. two armed locking lever pivotally mounted between said plates, two pawls at the rear end. of said over designed to en age with said notchesof said plates, the pointed front end of said lever, a stud of the transfer wheel designed to act upon the front end of said lover a pull spring for each of said plates, an a cam for each of said plates, and the sliding rod adapted to push a ainst said cams, substantially as describe the purpose set forth. a

In witness whereof I have hereunto my hand in the presence of two witnesses.

CARL women.

Witnesses Wownmm Ham, ARTHUR Scnnonosn.

and shown and for I 

